ISO 8859 Article, Signification, Explication
ISO 8859, également appelé plus formellement ISO/CEI 8859, est une norme commune de l'ISO et de la CEI d'encodage de caractères sur 8 bits pour le traitement informatique du texte. Le standard est divisé en parties numérotées publiées séparément, telles que ISO/CEI 8859-1, ISO/CEI 8859-2, etc., chacune pouvant être référencée de façon informelle en tant que norme en tant que telle. La norme comprend actuellement 15 parties.
| Table of contents |
|
2 Caractères 3 Les parties du standard ISO 8859 4 Relations avec Unicode et UCS 5 État de développement 6 Références |
Introduction
Alors que les 96 caractères imprimables ASCII sont suffisants pour échanger des informations en anglais courant, la plupart des autres langues utilisant l'alphabet romain ont besoin de symboles additionnels non couverts par l'ASCII, tels que ß (allemand), å (suédois et d'autres langues nordiques). ISO 8859 a cherché à remédier à ce problème en utilisant le huitième bit, alors inutilisé en ASCII, pour donner de la place à 128 caractères supplémentaires. Cependant, plus de caractères étaient nécessaires pour parvenir à cette fin par rapport à ce qu'aurait permis un unique encodage de caractères sur 8 bits, aussi plusieurs tables de correspondances ont été développées, en incluant au moins 10 tables pour couvrir uniquement le script latin avec les langues modernes officielles.
La norme ISO 8859-n n'est pas totalement identique aux encodages de caractères bien connus ISO-8859-n approuvés par l'IANA pour l'utilisation sur l'Internet. Au-delà du trait d'union ajouté présent dans le nom approuvé par l'IANA, les encodages diffèrent de sorte que chaque partie du standard ISO assigne, au maximum, 191 caractères dans les étendues d'octets 32 à 126 et 160 à 255, alors que l'encodage de caractère correspondant approuvé par l'IANA fusionne ces tables de correspondances avec le jeu de contrôle C0 (caractères de contrôles positionnés aux octets de 0 à 31) et le jeu de contrôle C1 (caractères de contrôles positionnés aux octets de 127 à 159), ce qui conduit à une table de caractères 8 bits complète, avec la plupart, sinon la totalité, des valeurs d'octets assignées.
Caractères
La norme ISO 8859 est conçue pour l'échange fiable d'informations, et non pour la typographie; elle omet des symboles nécessaires pour la typographie de haute qualité, telles que les ligatures optionnelles, les marques de citation incurvées, les tirets, etc. de ce fait, les systèmes de composition avancés utilisent souvent des extensions propriétaires ou pointilleuses au-delà des standards ASCII et ISO 8859, ou utilisent plutôt Unicode.
As a rule of thumb, if a character or symbol was not already part of a widely used data-processing character set and was also not usually provided on typewriter keyboards for a national language, it didn't get in. Hence the directional double quotation marks « and » used for some European languages were included, but not the directional double quotation marks “ and ” used for English and some other languages. French didn't get its œ and Œ ligatures because French speakers had not previously needed them enough to demand them on their keyboards; nor did it get Ÿ, because this character is only used in French in all caps text. These characters were, however, included later with ISO 8859-15, which also introduced the new Euro character €. Likewise Dutch did not get the 'ij' and 'IJ' letters, because Dutch speakers had gotten used to typing these as two letters instead. Romanian did not initially get its 'Ș/ș' and 'Ț/ț' letters, because these letters were initially unified with 'Ş/ş' and 'Ţ/ţ' by the Unicode Consortium, considering the shapes with comma beneath to be glyph variants of the shapes with cedilla. However, the letters with explicit comma below were later added to the Unicode standard and are also in ISO 8859-16.
Most of the ISO 8859 encodings provide diacritic marks required for various European languages. Others provide non-Roman alphabets: Greek, Cyrillic, Hebrew, Arabic and Thai. However, the standard makes no provision for the scripts of East Asian languages (CJK), as their ideographic writing systems require many thousands of code points. Although it uses Latin based characters, Vietnamese does not fit into 96 positions either; Japanese syllabic Kana scripts, on the other hand, might, but like several other alphabets of the world isn't encoded.
Each part of ISO 8859 is designed to support languages that often borrow from each other, so the characters needed by each language are usually accommodated by a single part. However, there are some characters and language combinations that are not accommodated without transcriptions. Efforts were made to make conversions as smooth as possible. For example, German has all its seven special chars at the same positions in all Latin variants (1-4, 9-10, 13-16), and in many positions the characters only differ in the diacritics between the sets. In particular, variants 1-4 were designed jointly, and have the property that every encoded character appears either at a given position or not at all.Les parties du standard ISO 8859
ISO 8859 est constitué à ce jour des parties suivantes:
s*ISO 8859-6 (arabe) — Covers the most common Arabic glyphs, although not nearly all of them.
¹: only the IJ/ij (Dutch Y) is missing, which can be represented as IJ
²: missing characters are in ISO 8859-15
| binaire | Oct | Déc | Hex | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 13 | 14 | 15 | 16 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 10100000 | 240 | 160 | A0 | NBSP | |||||||||||||||
| 10100001 | 241 | 161 | A1 | ¡ | Ą | Ħ | Ą | Ё | ʽ | ¡ | Ą | ก | " | Ḃ | ¡ | Ą | |||
| 10100010 | 242 | 162 | A2 | ¢ | ˘ | ˘ | ĸ | Ђ | ʼ | ¢ | ¢ | Ē | ข | ¢ | ḃ | ¢ | ą | ||
| 10100011 | 243 | 163 | A3 | £ | Ł | £ | Ŗ | Ѓ | £ | £ | £ | Ģ | ฃ | £ | £ | £ | Ł | ||
| 10100100 | 244 | 164 | A4 | ¤ | ¤ | ¤ | ¤ | Є | ¤ | € | ¤ | ¤ | Ī | ค | ¤ | Ċ | € | € | |
| 10100101 | 245 | 165 | A5 | ¥ | Ľ | Ĩ | Ѕ | ₯ | ¥ | ¥ | Ĩ | ฅ | " | ċ | ¥ | " | |||
| 10100110 | 246 | 166 | A6 | ¦ | Ś | Ĥ | Ļ | І | ¦ | ¦ | ¦ | Ķ | ฆ | ¦ | Ḋ | Š | Š | ||
| 10100111 | 247 | 167 | A7 | § | § | § | § | Ї | § | § | § | § | ง | § | § | § | § | ||
| 10101000 | 250 | 168 | A8 | ¨ | ¨ | ¨ | ¨ | Ј | ¨ | ¨ | ¨ | Ļ | จ | Ø | Ẁ | š | š | ||
| 10101001 | 251 | 169 | A9 | © | Š | İ | Š | Љ | © | © | © | Đ | ฉ | © | © | © | © | ||
| 10101010 | 252 | 170 | AA | ª | Ş | Ş | Ē | Њ | × | ª | Š | ช | Ŗ | Ẃ | ª | Ș | |||
| 10101011 | 253 | 171 | AB | « | Ť | Ğ | Ģ | Ћ | « | « | « | Ŧ | ซ | « | ḋ | « | « | ||
| 10101100 | 254 | 172 | AC | ¬ | Ź | Ĵ | Ŧ | Ќ | ، | ¬ | ¬ | ¬ | Ž | ฌ | ¬ | Ỳ | ¬ | Ź | |
| 10101101 | 255 | 173 | AD | | | | | | | | | | | ญ | | | | | |
| 10101110 | 256 | 174 | AE | ® | Ž | Ž | Ў | ® | ® | Ū | ฎ | ® | ® | ® | ź | ||||
| 10101111 | 257 | 175 | AF | ¯ | Ż | Ż | ¯ | Џ | ― | ‾ | ¯ | Ŋ | ฏ | Æ | Ÿ | ¯ | Ż | ||
| 10110000 | 260 | 176 | B0 | ° | ° | ° | ° | А | ° | ° | ° | ° | ฐ | ° | Ḟ | ° | ° | ||
| 10110001 | 261 | 177 | B1 | ± | ą | ħ | ą | Б | ± | ± | ± | ą | ฑ | ± | ḟ | ± | ± | ||
| 10110010 | 262 | 178 | B2 | ² | ˛ | ² | ˛ | В | ² | ² | ² | ē | ฒ | ² | Ġ | ² | Č | ||
| 10110011 | 263 | 179 | B3 | ³ | ł | ³ | ŗ | Г | ³ | ³ | ³ | ģ | ณ | ³ | ġ | ³ | ł | ||
| 10110100 | 264 | 180 | B4 | ´ | ´ | ´ | ´ | Д | ΄ | ´ | ´ | ī | ด | " | Ṁ | Ž | Ž | ||
| 10110101 | 265 | 181 | B5 | µ | ľ | µ | ĩ | Е | ΅ | µ | µ | ĩ | ต | µ | ṁ | µ | " | ||
| 10110110 | 266 | 182 | B6 | ¶ | ś | ĥ | ļ | Ж | Ά | ¶ | ¶ | ķ | ถ | ¶ | ¶ | ¶ | ¶ | ||
| 10110111 | 267 | 183 | B7 | · | ˇ | · | ˇ | З | · | · | · | · | ท | · | Ṗ | · | · | ||
| 10111000 | 270 | 184 | B8 | ¸ | ¸ | ¸ | ¸ | И | Έ | ¸ | ¸ | ļ | ธ | ø | ẁ | ž | ž | ||
| 10111001 | 271 | 185 | B9 | ¹ | š | ı | š | Й | Ή | ¹ | ¹ | đ | น | ¹ | ṗ | ¹ | č | ||
| 10111010 | 272 | 186 | BA | º | ş | ş | ē | К | Ί | ÷ | º | š | บ | ŗ | ẃ | º | ș | ||
| 10111011 | 273 | 187 | BB | » | ť | ğ | ģ | Л | ؛ | » | » | » | ŧ | ป | » | Ṡ | » | » | |
| 10111100 | 274 | 188 | BC | ¼ | ź | ĵ | ŧ | М | Ό | ¼ | ¼ | ž | ผ | ¼ | ỳ | Œ | Œ | ||
| 10111101 | 275 | 189 | BD | ½ | ˝ | ½ | Ŋ | Н | ½ | ½ | ½ | ― | ฝ | ½ | Ẅ | œ | œ | ||
| 10111110 | 276 | 190 | BE | ¾ | ž | ž | О | Ύ | ¾ | ¾ | ū | พ | ¾ | ẅ | Ÿ | Ÿ | |||
| 10111111 | 277 | 191 | BF | ¿ | ż | ż | ŋ | П | ؟ | Ώ | ¿ | ŋ | ฟ | æ | ṡ | ¿ | ż | ||
| 11000000 | 300 | 192 | C0 | À | Ŕ | À | Ā | Р | ΐ | À | Ā | ภ | Ą | À | À | À | |||
| 11000001 | 301 | 193 | C1 | Á | Á | Á | Á | С | ء | Α | Á | Á | ม | Į | Á | Á | Á | ||
| 11000010 | 302 | 194 | C2 | Â | Â | Â | Â | Т | آ | Β | Â | Â | ย | Ā | Â | Â | Â | ||
| 11000011 | 303 | 195 | C3 | Ã | Ă | Ã | У | أ | Γ | Ã | Ã | ร | Ć | Ã | Ã | Ă | |||
| 11000100 | 304 | 196 | C4 | Ä | Ä | Ä | Ä | Ф | ؤ | Δ | Ä | Ä | ฤ | Ä | Ä | Ä | Ä | ||
| 11000101 | 305 | 197 | C5 | Å | Ĺ | Ċ | Å | Х | إ | Ε | Å | Å | ล | Å | Å | Å | Ć | ||
| 11000110 | 306 | 198 | C6 | Æ | Ć | Ĉ | Æ | Ц | ئ | Ζ | Æ | Æ | ฦ | Ę | Æ | Æ | Æ | ||
| 11000111 | 307 | 199 | C7 | Ç | Ç | Ç | Į | Ч | ا | Η | Ç | Į | ว | Ē | Ç | Ç | Ç | ||
| 11001000 | 310 | 200 | C8 | È | Č | È | Č | Ш | ب | Θ | È | Č | ศ | Č | È | È | È | ||
| 11001001 | 311 | 201 | C9 | É | É | É | É | Щ | ة | Ι | É | É | ษ | É | É | É | É | ||
| 11001010 | 312 | 202 | CA | Ê | Ę | Ê | Ę | Ъ | ت | Κ | Ê | Ę | ส | Ź | Ê | Ê | Ê | ||
| 11001011 | 313 | 203 | CB | Ë | Ë | Ë | Ë | Ы | ث | Λ | Ë | Ë | ห | Ė | Ë | Ë | Ë | ||
| 11001100 | 314 | 204 | CC | Ì | Ě | Ì | Ė | Ь | ج | Μ | Ì | Ė | ฬ | Ģ | Ì | Ì | Ì | ||
| 11001101 | 315 | 205 | CD | Í | Í | Í | Í | Э | ح | Ν | Í | Í | อ | Ķ | Í | Í | Í | ||
| 11001110 | 316 | 206 | CE | Î | Î | Î | Î | Ю | خ | Ξ | Î | Î | ฮ | Ī | Î | Î | Î | ||
| 11001111 | 317 | 207 | CF | Ï | Ď | Ï | Ī | Я | د | Ο | Ï | Ï | ฯ | Ļ | Ï | Ï | Ï | ||
| 11010000 | 320 | 208 | D0 | Ð | Đ | Đ | а | ذ | Π | Ğ | Ð | ะ | Š | Ŵ | Ð | Ð | |||
| 11010001 | 321 | 209 | D1 | Ñ | Ń | Ñ | Ņ | б | ر | Ρ | Ñ | Ņ | ั | Ń | Ñ | Ñ | Ń | ||
| 11010010 | 322 | 210 | D2 | Ò | Ň | Ò | Ō | в | ز | Ò | Ō | า | Ņ | Ò | Ò | Ò | |||
| 11010011 | 323 | 211 | D3 | Ó | Ó | Ó | Ķ | г | س | Σ | Ó | Ó | ำ | Ó | Ó | Ó | Ó | ||
| 11010100 | 324 | 212 | D4 | Ô | Ô | Ô | Ô | д | ش | Τ | Ô | Ô | ิ | Ō | Ô | Ô | Ô | ||
| 11010101 | 325 | 213 | D5 | Õ | Ő | Ġ | Õ | е | ص | Υ | Õ | Õ | ี | Õ | Õ | Õ | Ő | ||
| 11010110 | 326 | 214 | D6 | Ö | Ö | Ö | Ö | ж | ض | Φ | Ö | Ö | ึ | Ö | Ö | Ö | Ö | ||
| 11010111 | 327 | 215 | D7 | × | × | × | × | з | ط | Χ | × | Ũ | ื | × | Ṫ | × | Ś | ||
| 11011000 | 330 | 216 | D8 | Ø | Ř | Ĝ | Ø | и | ظ | Ψ | Ø | Ø | ุ | Ų | Ø | Ø | Ű | ||
| 11011001 | 331 | 217 | D9 | Ù | Ů | Ù | Ų | й | ع | Ω | Ù | Ų | ู | Ł | Ù | Ù | Ù | ||
| 11011010 | 332 | 218 | DA | Ú | Ú | Ú | Ú | к | غ | Ϊ | Ú | Ú | ฺ | Ś | Ú | Ú | Ú | ||
| 11011011 | 333 | 219 | DB | Û | Ű | Û | Û | л | Ϋ | Û | Û | Ū | Û | Û | Û | ||||
| 11011100 | 334 | 220 | DC | Ü | Ü | Ü | Ü | м | ά | Ü | Ü | Ü | Ü | Ü | Ü | ||||
| 11011101 | 335 | 221 | DD | Ý | Ý | Ŭ | Ũ | н | έ | İ | Ý | Ż | Ý | Ý | Ę | ||||
| 11011110 | 336 | 222 | DE | Þ | Ţ | Ŝ | Ū | о | ή | Ş | Þ | Ž | Ŷ | Þ | Ț | ||||
| 11011111 | 337 | 223 | DF | ß | ß | ß | ß | п | ί | ‗ | ß | ß | ฿ | ß | ß | ß | ß | ||
| 11100000 | 340 | 224 | E0 | à | ŕ | à | ā | р | ـ | ΰ | א | à | ā | เ | ą | à | à | à | |
| 11100001 | 341 | 225 | E1 | á | á | á | á | с | ف | α | ב | á | á | แ | į | á | á | á | |
| 11100010 | 342 | 226 | E2 | â | â | â | â | т | ق | β | ג | â | â | โ | ā | â | â | â | |
| 11100011 | 343 | 227 | E3 | ã | ă | ã | у | ك | γ | ד | ã | ã | ใ | ć | ã | ã | ă | ||
| 11100100 | 344 | 228 | E4 | ä | ä | ä | ä | ф | ل | δ | ה | ä | ä | ไ | ä | ä | ä | ä | |
| 11100101 | 345 | 229 | E5 | å | ĺ | ċ | å | х | م | ε | ו | å | å | ๅ | å | å | å | ć | |
| 11100110 | 346 | 230 | E6 | æ | ć | ĉ | æ | ц | ن | ζ | ז | æ | æ | ๆ | ę | æ | æ | æ | |
| 11100111 | 347 | 231 | E7 | ç | ç | ç | į | ч | ه | η | ח | ç | į | ็ | ē | ç | ç | ç | |
| 11101000 | 350 | 232 | E8 | è | č | è | č | ш | و | θ | ט | è | č | ่ | č | è | è | è | |
| 11101001 | 351 | 233 | E9 | é | é | é | é | щ | ى | ι | י | é | é | ้ | é | é | é | é | |
| 11101010 | 352 | 234 | EA | ê | ę | ê | ę | ъ | ي | κ | ך | ê | ę | ๊ | ź | ê | ê | ê | |
| 11101011 | 353 | 235 | EB | ë | ë | ë | ë | ы | ً | λ | כ | ë | ë | ๋ | ė | ë | ë | ë | |
| 11101100 | 354 | 236 | EC | ì | ě | ì | ė | ь | ٌ | μ | ל | ì | ė | ์ | ģ | ì | ì | ì | |
| 11101101 | 355 | 237 | ED | í | í | í | í | э | ٍ | ν | ם | í | í | ํ | ķ | í | í | í | |
| 11101110 | 356 | 238 | EE | î | î | î | î | ю | َ | ξ | מ | î | î | ๎ | ī | î | î | î | |
| 11101111 | 357 | 239 | EF | ï | ď | ï | ī | я | ُ | ο | ן | ï | ï | ๏ | ļ | ï | ï | ï | |
| 11110000 | 360 | 240 | F0 | ð | đ | đ | № | ِ | π | נ | ğ | ð | ๐ | š | ŵ | ð | đ | ||
| 11110001 | 361 | 241 | F1 | ñ | ń | ñ | ņ | ё | ّ | ρ | ס | ñ | ņ | ๑ | ń | ñ | ñ | ń | |
| 11110010 | 362 | 242 | F2 | ò | ň | ò | ō | ђ | ْ | ς | ע | ò | ō | ๒ | ņ | ò | ò | ò | |
| 11110011 | 363 | 243 | F3 | ó | ó | ó | ķ | ѓ | σ | ף | ó | ó | ๓ | ó | ó | ó | ó | ||
| 11110100 | 364 | 244 | F4 | ô | ô | ô | ô | є | τ | פ | ô | ô | ๔ | ō | ô | ô | ô | ||
| 11110101 | 365 | 245 | F5 | õ | ő | ġ | õ | ѕ | υ | ץ | õ | õ | ๕ | õ | õ | õ | ő | ||
| 11110110 | 366 | 246 | F6 | ö | ö | ö | ö | і | φ | צ | ö | ö | ๖ | ö | ö | ö | ö | ||
| 11110111 | 367 | 247 | F7 | ÷ | ÷ | ÷ | ÷ | ї | χ | ק | ÷ | ũ | ๗ | ÷ | ṫ | ÷ | ś | ||
| 11111000 | 370 | 248 | F8 | ø | ř | ĝ | ø | ј | ψ | ר | ø | ø | ๘ | ų | ø | ø | ű | ||
| 11111001 | 371 | 249 | F9 | ù | ů | ù | ų | љ | ω | ש | ù | ų | ๙ | ł | ù | ù | ù | ||
| 11111010 | 372 | 250 | FA | ú | ú | ú | ú | њ | ϊ | ת | ú | ú | ๚ | ś | ú | ú | ú | ||
| 11111011 | 373 | 251 | FB | û | ű | û | û | ћ | ϋ | û | û | ๛ | ū | û | û | û | |||
| 11111100 | 374 | 252 | FC | ü | ü | ü | ü | ќ | ό | ü | ü | ü | ü | ü | ü | ||||
| 11111101 | 375 | 253 | FD | ý | ý | ŭ | ũ | § | ύ | ı | ý | ż | ý | ý | ę | ||||
| 11111110 | 376 | 254 | FE | þ | ţ | ŝ | ū | ў | ώ | ş | þ | ž | ŷ | þ | ț | ||||
| 11111111 | 377 | 255 | FF | ÿ | ˙ | ˙ | ˙ | џ | ÿ | ĸ | ’ | ÿ | ÿ | ÿ | |||||
Relations avec Unicode et UCS
Since 1991, the Unicode Consortium has been working with ISO to develop the Unicode Standard and ISO/IEC 10646: the Universal Character Set (UCS) in tandem. This pair of standards was created to unify the ISO 8859 character repertoire, among others, by assigning each character, initially, to a 16-bit code value, with some code values left unassigned. Over time, their models adapted to map characters to abstract numeric code points rather than fixed bit-width values, so that more code points and encoding methods could be supported.
Unicode and ISO/IEC 10646 currently assign about 100,000 characters to a code space consisting of over a million code points, and they define several standard encodings that are capable of representing every available code point. The standard encodings of Unicode and the UCS use sequences of one to four 8-bit code values (UTF-8), sequences of one or two 16-bit code values (UTF-16), or one 32-bit code value (UTF-32 or UCS-4). There is also an older encoding that uses one 16-bit code value (UCS-2), capable of representing one-seventeenth of the available code points. Of these encoding forms, only UTF-8's byte sequences are in a fixed order; the others are subject to platform-dependent byte ordering issues that may be addressed via special codes or indicated via out-of-band means.
Newer editions of ISO 8859 express characters in terms of their Unicode/UCS names and the U+nnnn notation, effectively causing each part of ISO 8859 to be a Unicode/UCS character encoding scheme that maps a very small subset of the UCS to single 8-bit bytes. The first 256 characters in Unicode and the UCS are identical to those in ISO-8859-1.
ISO 8859 was favored throughout the 1990s, having the advantages of being well-established and more easily implemented in software: the equation of one byte to one character is simple and adequate for most single-language applications, and there are no combining characters or variant forms.
As the relative cost, in computing resources, of using more than one byte per character began to diminish, programming languages and operating systems added native support for Unicode alongside their system of code pages. As Unicode-enabled operating systems became more widespread, ISO 8859 and other legacy encodings became less popular. While remnants of ISO 8859 and single-byte character models remain entrenched in many operating systems, programming languages, data storage systems, networking applications, display hardware, and end-user application software, most modern computing applications use Unicode internally, and rely on conversion tables to map to and from the simpler encodings, when necessary.
C'est un article concernant le ISO 8859. La page contient la signification du ISO 8859 , Description et explication au sujet de ISO 8859 État de développement
The ISO/IEC 8859 standard was maintained by ISO/IEC Joint Technical Committee 1, Subcommittee 2, Working Group 3 (ISO/IEC JTC 1/SC 2/WG 3). In June 2004, WG 3 disbanded, and maintenance duties were transferred to SC 2. The standard is not currently being updated, as the Subcommittee's only remaining Working Group, WG 2, is concentrating on development of ISO/IEC 10646.Références
